--- title: Documentation changelog --- > Agent instructions: > **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown. > > - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version. > - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt). On this page, you can find a summary of changes made to the Kentico Xperience 13 documentation. This changelog is not directly related to product updates, or the introduction of new features (for those, refer to the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md)), but rather to the documentation itself: newly created pages, significant changes to existing pages, overhauls of specific sections of the documentation, etc. ## November 27, 2025 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 14. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## November 21, 2024 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 13. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## March 7, 2024 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 12. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## December 7, 2023 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 11. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## June 22, 2023 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 10. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## May 15, 2023 - **ADDED** SEO – A sample implementation of a [sitemap generator](https://docs.kentico.com/13/configuring-xperience/search-engine-optimization.md) was added to the documentation. ## March 23, 2023 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 9. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## December 13, 2022 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 8. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## October 25, 2022 - **ADDED** [Managing field data types](https://docs.kentico.com/13/custom-development/managing-field-data-types.md) – Provides an overview of [field editor](https://docs.kentico.com/13/custom-development/extending-the-administration-interface/developing-form-controls/reference-field-editor.md) data types and covers how to register custom data types into the system (e.g., for use with [form components](https://docs.kentico.com/13/developing-websites/form-builder-development/developing-form-components.md)). ## September 29, 2022 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 7. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## June 10, 2022 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 6. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## March 29, 2022 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 5. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## March 14, 2022 - **ADDED** [Decorating system services](https://docs.kentico.com/13/custom-development/decorating-system-services.md) – New page that explores options available to developers who wish to modify the behavior of system service classes via the decorator pattern. ## January 24, 2022 - **ADDED** [Content modeling guide](https://docs.kentico.com/13/developing-websites/content-modeling-guide.md) – New chapter that serves as an exhaustive introduction to modeling content in Xperience. On these pages, you can learn about [storing content and taxonomy](https://docs.kentico.com/13/developing-websites/content-modeling-guide/storing-content-in-xperience.md), [designing and displaying content](https://docs.kentico.com/13/developing-websites/content-modeling-guide/designing-content-in-xperience.md) on a website, or about general [content modeling recommendations](https://docs.kentico.com/13/developing-websites/content-modeling-guide/general-content-modeling-recommendations.md). ## December 2, 2021 - **UPDATED** Email marketing – Added information about the potential impacts of the Apple Mail Privacy Protection feature on the reliability of [marketing email open rate tracking](https://docs.kentico.com/13/on-line-marketing-features/managing-your-on-line-marketing-features/email-marketing/tracking-marketing-emails.md). ## November 23, 2021 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 4. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. ## September 14, 2021 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 3. See the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. - **UPDATED** Form builder – The overall form builder developer documentation was updated to reflect the differences between ASP.NET MVC 5 and ASP.NET Core development models. Affected pages within the section can now be changed via the [development model switcher](https://docs.kentico.com/13/developing-websites/xperience-development-models.md). ## August 24, 2021 - **UPDATED** Localization – The localization documentation for the Core and MVC 5 development model was merged into the [Setting up multilingual websites](https://docs.kentico.com/13/multilingual-websites/setting-up-multilingual-websites.md) and [Setting up a multilingual user interface](https://docs.kentico.com/13/multilingual-websites/setting-up-a-multilingual-user-interface.md) sections. Affected pages within the section can now be changed via the [development model switcher](https://docs.kentico.com/13/developing-websites/xperience-development-models.md). ## August 23, 2021 - **ADDED** A [terminology glossary](https://docs.kentico.com/13/xperience-terminology-glossary.md) of terms commonly used in the Kentico Xperience administration interface and documentation was created. ## August 9, 2021 - **UPDATED** Xperience membership integration – The membership documentation for the Core and MVC 5 development model was merged into the [Integrating Xperience membership](https://docs.kentico.com/13/managing-users/user-registration-and-authentication/integrating-xperience-membership.md) section. Affected pages within the section can now be changed via the [development model switcher](https://docs.kentico.com/13/developing-websites/xperience-development-models.md). ## July 15, 2021 - **ADDED** Pages that include the development model switcher can now be linked with a specific model pre-selected. You can add the _devmodel_ URL parameter with one of the following values to the end of the URL: - _mvc_ – e.g., https://docs.kentico.com/13/developing-websites/page-builder-development/developing-widgets?devmodel=mvc - _core_ – e.g., https://docs.kentico.com/13/developing-websites/page-builder-development/developing-widgets?devmodel=core ## June 22, 2021 - **ADDED** Overall update of the documentation to include new content for Kentico Xperience Refresh 2. See the the [release notes](https://docs.kentico.com/13/release-notes-xperience-13.md) for details. - **UPDATED** Page builder – The page builder documentation for the Core and MVC 5 development model was merged into the [Page builder development](https://docs.kentico.com/13/developing-websites/page-builder-development.md) section. Affected pages within the section can now be changed via the [development model switcher](https://docs.kentico.com/13/developing-websites/xperience-development-models.md). - **UPDATED** Form builder – The form builder documentation for the Core and MVC 5 development model was merged into the [Form builder development](https://docs.kentico.com/13/developing-websites/form-builder-development.md) section. Affected pages within the section can now be changed via the development model switcher. ## June 17, 2021 - **ADDED** Updated the overall structure of the [Kentico Xperience Tutorial](https://docs.kentico.com/13tutorial.md) and individual pages of the [Business tutorial](https://docs.kentico.com/13tutorial/business-tutorial.md). In addition to the new format, the Business tutorial now includes more instructional videos and new pages about the Xperience digital marketing functionality: - [Customer data management](https://docs.kentico.com/13tutorial/business-tutorial/customer-data-management.md) - [Content personalization](https://docs.kentico.com/13tutorial/business-tutorial/content-personalization.md) - [Marketing automation](https://docs.kentico.com/13tutorial/business-tutorial/marketing-automation.md) - [Email marketing](https://docs.kentico.com/13tutorial/business-tutorial/email-marketing.md) - **ADDED** [Adding custom assemblies](https://docs.kentico.com/13/custom-development/adding-custom-assemblies.md) - Summarizes the best practices for creating assemblies (_Class Library_ projects) for custom code within Xperience. Also describes how to ensure class discovery within the assemblies. ## May 24, 2021 - **UPDATED** Added general support for a selector that switches pages between content suitable for the ASP.NET Core and MVC 5 [development models](https://docs.kentico.com/13/developing-websites/xperience-development-models.md). The selector is located directly under the main heading of pages that have been updated to include content for both models. At this time, only several pages have been updated and more will follow in the future. For example: - [Enabling content tree-based routing](https://docs.kentico.com/13/developing-websites/implementing-routing/content-tree-based-routing/enabling-content-tree-based-routing.md) - [Configuring cookie SameSite mode](https://docs.kentico.com/13/developing-websites/working-with-cookies/configuring-cookie-samesite-mode.md) ## April 6, 2021 - **ADDED** [Xperience development models](https://docs.kentico.com/13/developing-websites/xperience-development-models.md) - Provides an overview of the two development models available for Xperience websites – ASP.NET Core and ASP.NET MVC 5. ## March 29, 2021 - **UPDATED** [Caching page output in ASP.NET Core applications](https://docs.kentico.com/13/developing-websites/developing-xperience-applications-using-asp-net-core/caching-page-output-in-asp-net-core-applications.md) - Updated with best practices for caching different versions of page output when using [page templates](https://docs.kentico.com/13/developing-websites/page-builder-development/developing-page-templates.md) (using _vary-by-route_). ## March 19, 2021 - **UPDATED** [Maintaining multilingual stores](https://docs.kentico.com/13/e-commerce-features/managing-on-line-stores/maintaining-multilingual-stores.md) - Added information about editing multilingual products under workflow. - **UPDATED** [Page database structure](https://docs.kentico.com/13/custom-development/working-with-pages-in-the-api/page-database-structure.md) - Added a section explaining the database structure of product objects (_COM\_SKU_ database table) and associated pages (_CMS\_Tree_ database table).